Crossword Genius

Method of arranging all the parts (7)

Ross

I believe the answer is:

casting

I'm a little stuck... Click here to teach me more about this clue!

'method of arranging' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'all the parts' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'casing' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for casting that I've seen before include "Shaping in mould; assigning actors to" , "-- Vote; -- couch" , "Choosing actors" , "Throwing" , "shell across back of fort" .)

I've seen this clue in The Globe and Mail.
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